I bought the XL. They are reasonably comfortable, but because the fabric is thin and flexible, it bunches up in my mouth when I talk. I have to pull on the bottom of the mask in meetings in order to keep the fabric from acting like a gag. I tried stretching the ear straps to see if that would help, but it didn't. Not a fan.This two ply organic mask is so fresh and light on your skin ! Your able to wear it all day without and sweating , so no MASKNE.. AN ABSOLUTE MUST FOR ANYONE IN NEED OF AN ALL DAY MASK...The mask makes my glasses fog easily. It doesn’t really have a way to hold the fabric away from your mouth.I'm allergic to the treated center layer of masks...These masks are listed as S/M, but the only person they’ll fit out of four adult-sized people , are my 6’2” husband. The thick ear loops make them nearly impossible to adjust smaller, which would probably help. And they’ll feel very thin, despite being advertised as 2-ply. So maybe for a large, vaccinated male, they’d work great.I returned them because they don’t work and don’t stay on my face. Still waiting for a refund, it’s been 2 weeks since they received my package.